Key chain



FIG. 1 is a perspective view of a key chain showing my new design;

FIG. 2 is a side elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a bottom plan view;

FIG. 5 is a front elevational view; and,

FIG. 6 is a rear elevational view. 

The ornamental design for a key chain, as shown. 